.kc_box{
    width: 100%;
    padding: 0 0.68rem;
    box-sizing: border-box;
    
}
.item_box{
    width: 100%;
}
.item_top{
    width: 100%;
    height: 4.5rem;
    background: chartreuse;
    padding: 0.8rem 0;
    box-sizing: border-box;
}